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Note Guarantees (Changes in the Corporation's liability of estimated losses from credit recourses agreements) (Detail) - Financial Guarantee - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Guarantor Obligations |  |
Balance as of beginning of period | $ 58,820 | $ 54,489
Provision for recourse liability | 12,200 | 20,446
Net charge-offs | (14,790) | (16,115)
Balance as of end of period | $ 56,230 | $ 58,820

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